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Message-ID: <CAFBinCAASQUB=cg5EFsBQ4jd3TvcCJzV1=sYJci4ibR7FjRcww@mail.gmail.com>
Date: Fri, 2 Jul 2021 11:19:37 +0200
From: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To: Stephen Boyd <sboyd@...nel.org>
Cc: Guenter Roeck <linux@...ck-us.net>, mturquette@...libre.com,
linux-clk@...r.kernel.org,
Neil Armstrong <narmstrong@...libre.com>, jbrunet@...libre.com,
khilman@...libre.com, linux-kernel@...r.kernel.org,
linux-amlogic@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 2/3] clk: divider: Switch from .round_rate to
.determine_rate by default
Hi Stephen,
On Fri, Jul 2, 2021 at 3:02 AM Stephen Boyd <sboyd@...nel.org> wrote:
[...]
> My guess is that we have drivers copying the clk_ops from the
> divider_ops structure and so they are copying over round_rate but not
> determine_rate.
I just learned something new - thanks for investigating this as well!
$ git grep "clk_divider_ops\.round_rate" drivers/
drivers/clk/bcm/clk-bcm2835.c: return clk_divider_ops.round_rate(hw,
rate, parent_rate);
drivers/clk/clk-stm32f4.c: return clk_divider_ops.round_rate(hw,
rate, prate);
drivers/clk/clk-stm32h7.c: return clk_divider_ops.round_rate(hw,
rate, prate);
drivers/clk/clk-stm32mp1.c: req->rate =
clk_divider_ops.round_rate(hw, req->rate, &best_parent_rate);
drivers/clk/imx/clk-divider-gate.c: return
clk_divider_ops.round_rate(hw, rate, prate);
$ git grep "clk_divider_ro_ops\.round_rate" drivers/
$
Changing these over to use clk_divider_ops.determine_rate doesn't seem too hard.
The part that I am not sure about is how to organize the patches.
1) amend the changes to all relevant drivers (from above) to this patch
2) multiple patches:
- adding .determine_rate to the default divider ops (but not removing
.round_rate)
- a single patch for each relevant driver (from above)
- removing .round_rate from the default divider ops
Another approach is to first create clk_divider_determine_rate() (as
done here) and export it.
Then I could have one individual patch for each relevant driver (from
above) to use:
.determine_rate = clk_divider_determine_rate,
Then finally I could remove clk_divider_round_rate() and switch over
the default divider ops to .determine_rate as well.
Which way do you prefer?
Best regards,
Martin
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